Hi @Nazeer!
Thank you for contacting NXP Support!
According with i.MX Linux User's Guide, you could use the following:
• U-Boot > setenv displayinfo 'video=mxcfb1:dev=ldb video=mxcfb0:dev=hdmi,1920x1080
M@60,if=RGB24' for LVDS and HDMI dual displays
• U-Boot > setenv displayinfo 'video=mxcfb0:mxcfb0:dev=lcd,if=RGB565
video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24' for LCD and HDMI dual displays
Best Regards!
Chavira